论文部分内容阅读
星载多角度偏振成像仪可以获取目标的多角度偏振辐射信息,探测精度是重要的技术指标。为研究仪器的测量精度及相关的误差因素,以Stokes-Mueller为数学描述方法,分析仪器的原理和光路结构特点,从理论上推导了仪器的偏振辐射测量模型,并通过实验初步验证了镜头Mueller模型的正确性。在考虑目标光各种偏振态的情况下,分析了非理想光学器件重要参数对目标光偏振度测量结果的影响,得到了偏振度测量误差与通道相对透射率、空间高频相对透射率/响应率、线偏振片振透轴方位角、镜头线性双向衰减这四种参数偏差之间的关系。按照仪器探测精度要求,结合各参数偏差对应误差最敏感的目标光偏振态,从理论上提出了各重要参数的误差容限。该研究为整个仪器的研制、定标及后期数据处理提供了理论依据。
Spaceborne multi-angle polarimetric imager can acquire multi-angle polarized radiation information of the target, the detection accuracy is an important technical index. In order to study the measuring accuracy of the instrument and related error factors, the mathematical model of Stokes-Mueller, the principle of the instrument and the characteristics of the optical path were analyzed. The polarization radiation measurement model of the instrument was deduced theoretically. Correctness of the model. The influences of the important parameters of the non-ideal optical device on the polarization degree of the target light are analyzed under the condition of considering various polarization states of the target light. The measurement error of the polarization degree is compared with that of the channel relative transmittance, the spatial high frequency relative transmittance / response Rate, the linear polarizer vibration axis azimuth, the lens linear two-way attenuation of the relationship between the four parameters deviation. In accordance with the requirements of the detection accuracy of the instrument, combined with the polarization state of the target light corresponding to the most sensitive error of each parameter deviation, the error tolerance of each important parameter is theoretically proposed. The research provided a theoretical basis for the development of the entire instrument, calibration and post-data processing.